714. 



APPENDIX. 



[No. VI. 



Coregonus Thymalloides . Little Winter River Grayling. 



C. pinna dorsali magna radiis 22 equalibus, maxilla inferiore longiore, dentibus mandibulorum pala- 

 torum vomeris et pbaryngis parvis. 



This fish resembles the preceding in many points, and is caught in the same places. 

 Their teeth and intestines correspond. They differ slightly in shape, colour, and 

 lustre, but remarkably in the size of the dorsal fin. Its shades of colour are not so 

 beautifully arranged as in the preceding, and are less vivid, but its scales possess 

 more lustre. 



Its body is compressed : its lateral outline broadly lanceolate, tapering gradually 

 towards the tail. The belly is rather more obtuse than the back. Its sides are bluish 

 grey, with some purplish reflections, when moved in the light. 



The scales, partly orbicular and partly truncated, are of equal size throughout, 

 moderately large, and possess a bright pearly lustre. 



The dorsal fin is large, and like that of the preceding species, contains from twenty- 

 two to twenty-four rays, but the posterior ones do not branch out in the same man- 

 ner, and scarcely exceed the others in height ; hence the fin has a very different 

 aspect. It is about one inch high, has a dark bluish-grey colour, with several rows 

 of spots, having purple centres and light-red borders. It has also several perpen- 

 dicular opake whitish streaks. The other fins are the same with those of the 

 C. signifer. 



B 8. P 17. D 24. V 9. A 10. C20. 



The usual size of this fish is eight inches. 



Coregonus Quadrilateralis. Round Fish. 



Kathaeh, of the Copper Indians and okeugnak, of the Esquimaux. 



Sea Gwiniad. Arctic Zoology, lntrod. ccxcviii. vol.2, p. 393. No. 173, excluding the synon. of British Zoology, 



C. rostro obtuso, maxilla inferiori truncata sub-breviore, ore omnino edentulo, pinnae dorsalis radiis 11. 

 Tab. xxv. Fig. 2. 



Body.— Shape sub-fusiform. It is four-sided, with the angles rounded, and, when 

 viewed laterally, presents a lanceolate outline, tapering towards the tail. Its 

 form is elegant ; the back is slightly arched, the belly still less so. Its depth, imme- 

 diately anterior to the dorsal fin, is three inches, or about one-fifth of its length, and 

 its transverse diameter, at the lateral line, is about two inches. 



The colour of the scales on the back and sides is intermediate betwixt honey yellow 

 and wood brown, with a thin border of blackish grey round their exterior margins. 

 Those on the belly are white, and exhibit a pearly lustre. 



The scales are large, being between three and a half and four lines in diameter, and 

 have an irregular orbicular form, and much lustre. 



Head. — The forehead runs in a straight line as far as the nostrils, from whence 

 the obtuse but not broad snout droops suddenly. The maesial line from the occiput 



